First, I completely get that cap has to be rated to voltages it see (with some room for surges and such. I was reading in another thread that cap (E) should be run between 60-75% of their rating to stay formed properly. The reason I bring it up a have a 500v multi section can (reasonably new maybe 2-3 years old) left over from an earlier project. Size and C values would work well in new project but actual voltages are all 275v and under. So based on information I read, this cap would fail prematurely. Now the old ones ,we see, go 20, 30,40, sometimes 50 years. If I had confidence this would go 15 years (assuming it wasn't defective in the first place). I be happy with that. Should I be concerned?